/* =========================================================
   深圈 Pro · AI 分享 Slide 视觉系统
   舞台基准 1600 × 900（16:9），JS 等比缩放至视口
   ========================================================= */

:root {
  --bg: #05070E;
  --bg-2: #0A1022;
  --ink: #EDF1F8;
  --ink-2: #A3AFC5;
  --ink-3: #6C7A94;
  --line: rgba(255, 255, 255, 0.10);
  --line-soft: rgba(255, 255, 255, 0.06);
  --card: rgba(255, 255, 255, 0.035);
  --card-2: rgba(255, 255, 255, 0.06);

  --brand: #5B8CFF;
  --brand-2: #8A7BFF;
  --warm: #FF9F5A;
  --mint: #3FD9A4;
  --rose: #FF6B8A;

  --font: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Source Han Sans SC",
    "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SF Mono", "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;

  --pad-x: 96px;
  --pad-y: 74px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.is-black > #stage,
body.is-black > #chrome { opacity: 0; pointer-events: none; }

/* ---------- 舞台 ---------- */
#viewport {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background:
    radial-gradient(1200px 700px at 15% -10%, rgba(91, 140, 255, 0.16), transparent 60%),
    radial-gradient(1000px 600px at 90% 110%, rgba(138, 123, 255, 0.14), transparent 60%),
    linear-gradient(160deg, #05070E 0%, #080D1B 45%, #05070E 100%);
}

#stage {
  position: absolute;
  width: 1600px;
  height: 900px;
  transform-origin: center center;
  overflow: hidden;
}

.slide {
  position: absolute;
  inset: 0;
  padding: var(--pad-y) var(--pad-x);
  display: none;
  flex-direction: column;
  opacity: 0;
  overflow: hidden;
}

.slide.is-active {
  display: flex;
  animation: slideIn 0.42s cubic-bezier(0.2, 0.7, 0.25, 1) forwards;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 细网格底纹 */
#stage::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(1100px 700px at 50% 45%, #000 30%, transparent 85%);
}

/* ---------- 页眉 ---------- */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 34px;
  flex: 0 0 auto;
}

.sec {
  font-size: 16px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.sec::before {
  content: "";
  width: 26px;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), transparent);
}

.badge {
  font-size: 14px;
  letter-spacing: 0.06em;
  padding: 5px 13px;
  border-radius: 100px;
  border: 1px solid transparent;
  font-weight: 500;
}

.badge.demo { color: #9DC0FF; background: rgba(91, 140, 255, 0.12); border-color: rgba(91, 140, 255, 0.34); }
.badge.live { color: #FFC79A; background: rgba(255, 159, 90, 0.12); border-color: rgba(255, 159, 90, 0.34); }
.badge.case { color: #8DEBC7; background: rgba(63, 217, 164, 0.10); border-color: rgba(63, 217, 164, 0.30); }

.eyebrow .spacer { flex: 1; }

/* ---------- 标题体系 ---------- */
.title {
  font-size: 54px;
  line-height: 1.22;
  font-weight: 700;
  letter-spacing: 0.005em;
  flex: 0 0 auto;
}

.title.sm { font-size: 44px; }

.title em {
  font-style: normal;
  background: linear-gradient(100deg, var(--brand) 10%, var(--brand-2) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.title mark {
  background: none;
  color: var(--warm);
}

.lede {
  margin-top: 18px;
  font-size: 24px;
  line-height: 1.62;
  color: var(--ink-2);
  max-width: 1180px;
  flex: 0 0 auto;
}

.body { flex: 1 1 auto; display: flex; flex-direction: column; justify-content: center; min-height: 0; }

.kicker {
  margin-top: auto;
  padding-top: 26px;
  font-size: 25px;
  line-height: 1.55;
  color: var(--ink);
  border-top: 1px solid var(--line-soft);
  flex: 0 0 auto;
}

.kicker b { color: var(--warm); font-weight: 600; }
.kicker .q { color: var(--ink-3); font-size: 20px; display: block; margin-bottom: 8px; letter-spacing: .08em; }

.muted { color: var(--ink-3); }
.hl { color: var(--brand); }
.hl-w { color: var(--warm); }
.hl-m { color: var(--mint); }

/* ---------- 封面 ---------- */
.slide--cover { justify-content: center; padding-left: 120px; }

.cover-tag {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  align-self: flex-start;
  font-size: 17px;
  letter-spacing: 0.2em;
  color: var(--ink-2);
  padding: 9px 20px;
  border: 1px solid var(--line);
  border-radius: 100px;
  background: rgba(255, 255, 255, 0.03);
}

.cover-tag i { width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 12px var(--mint); }

.cover-title {
  margin-top: 40px;
  font-size: 92px;
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.01em;
}

.cover-title em {
  font-style: normal;
  background: linear-gradient(100deg, #6E9BFF 0%, #A78BFF 55%, #FF9F5A 105%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.cover-sub {
  margin-top: 30px;
  font-size: 27px;
  color: var(--ink-2);
  letter-spacing: 0.01em;
}

.cover-sub .dot { display: inline-block; width: 5px; height: 5px; border-radius: 50%; background: var(--ink-3); margin: 0 16px; vertical-align: middle; }

.cover-meta {
  margin-top: 66px;
  display: flex;
  gap: 72px;
  padding-top: 30px;
  border-top: 1px solid var(--line-soft);
}

.cover-meta span { display: block; font-size: 14px; letter-spacing: 0.18em; color: var(--ink-3); margin-bottom: 10px; }
.cover-meta b { display: block; font-size: 23px; font-weight: 600; }
.cover-meta i { display: block; font-style: normal; font-size: 17px; color: var(--ink-3); margin-top: 7px; }

/* ---------- 大字宣言页 ---------- */
.slide--statement { justify-content: center; align-items: flex-start; }

.statement {
  font-size: 74px;
  line-height: 1.32;
  font-weight: 700;
  letter-spacing: 0.005em;
  max-width: 1340px;
}

.statement.md { font-size: 60px; }

.statement em {
  font-style: normal;
  background: linear-gradient(100deg, var(--brand) 0%, var(--brand-2) 60%, var(--warm) 110%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.statement-sub { margin-top: 42px; font-size: 26px; line-height: 1.7; color: var(--ink-2); max-width: 1150px; }

/* ---------- 通用网格 ---------- */
.grid { display: grid; gap: 22px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
.g5 { grid-template-columns: repeat(5, 1fr); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px 26px 28px;
  position: relative;
  overflow: hidden;
}

.card .n {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  display: block;
  margin-bottom: 14px;
}

.card h4 { font-size: 27px; font-weight: 650; line-height: 1.35; margin-bottom: 12px; }
.card p { font-size: 18px; line-height: 1.68; color: var(--ink-2); }
.card ul { list-style: none; margin-top: 12px; }
.card li { font-size: 17px; line-height: 1.9; color: var(--ink-2); padding-left: 18px; position: relative; }
.card li::before { content: ""; position: absolute; left: 0; top: 14px; width: 6px; height: 1px; background: var(--ink-3); }

.card.accent { border-color: rgba(91, 140, 255, 0.34); background: linear-gradient(165deg, rgba(91, 140, 255, 0.13), rgba(91, 140, 255, 0.02)); }
.card.warm   { border-color: rgba(255, 159, 90, 0.34); background: linear-gradient(165deg, rgba(255, 159, 90, 0.12), rgba(255, 159, 90, 0.02)); }
.card.mint   { border-color: rgba(63, 217, 164, 0.30); background: linear-gradient(165deg, rgba(63, 217, 164, 0.10), rgba(63, 217, 164, 0.02)); }
.card.dim    { background: rgba(255, 255, 255, 0.018); border-style: dashed; }

.grid.tall { align-items: stretch; }
.grid.tall .card { min-height: 392px; }
.grid.mid { align-items: stretch; }
.grid.mid .card { min-height: 322px; }
.grid.mid .card h4 { font-size: 30px; }
.grid.mid .card p { font-size: 19px; line-height: 1.72; }

/* ---------- 听众分层卡 ---------- */
.level-card { padding-top: 34px; min-height: 364px; display: flex; flex-direction: column; align-items: flex-start; }
.level-card .says {
  margin-top: auto;
  padding-top: 20px;
  font-size: 19px;
  color: #A9C4FF;
  line-height: 1.5;
}
.level-card .lv {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.16em;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.07);
  color: var(--ink-2);
}
.level-card h4 { margin-top: 20px; font-size: 26px; }
.level-card p { font-size: 18px; }

/* ---------- 阶梯图 ---------- */
.stairs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: end;
  gap: 18px;
  height: 466px;
  margin-top: 4px;
}

.step {
  flex: 1;
  height: var(--h);
  border-radius: 16px 16px 0 0;
  border: 1px solid var(--line);
  border-bottom: none;
  background: linear-gradient(180deg, rgba(91, 140, 255, calc(var(--i) * 0.055)), rgba(91, 140, 255, 0.015));
  padding: 22px 20px;
  display: flex;
  flex-direction: column;
  position: relative;
}

.step::after {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -1px;
  height: 3px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  opacity: calc(0.25 + var(--i) * 0.15);
}

.step .lv {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.14em;
  color: var(--brand);
  opacity: 0.9;
}

.step h4 { font-size: 22px; font-weight: 650; margin-top: 11px; line-height: 1.38; }
.step p { font-size: 15px; color: var(--ink-3); margin-top: 9px; line-height: 1.55; }
.step .part { margin-top: auto; font-size: 14px; color: var(--ink-3); letter-spacing: 0.08em; }

.stairs-axis {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  font-size: 15px;
  color: var(--ink-3);
  border-top: 1px solid var(--line);
  padding-top: 13px;
  letter-spacing: 0.05em;
}
.stairs-axis span { text-align: center; }

/* ---------- 演进列表（五句话） ---------- */
.evo { display: flex; flex-direction: column; gap: 14px; }

.evo-row {
  display: grid;
  grid-template-columns: 92px 1fr 300px;
  align-items: center;
  gap: 26px;
  padding: 18px 26px;
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.02);
}

.evo-row .idx {
  font-family: var(--mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}

.evo-row .say { font-size: 27px; font-weight: 550; line-height: 1.4; }
.evo-row .tag { font-size: 17px; color: var(--ink-3); text-align: right; letter-spacing: 0.04em; }

.evo-row:nth-child(1) { background: rgba(255, 255, 255, 0.015); }
.evo-row:nth-child(4) { border-color: rgba(91, 140, 255, 0.28); background: rgba(91, 140, 255, 0.06); }
.evo-row:nth-child(5) {
  border-color: rgba(255, 159, 90, 0.38);
  background: linear-gradient(100deg, rgba(255, 159, 90, 0.13), rgba(255, 159, 90, 0.03));
}
.evo-row:nth-child(5) .say { color: #FFD8B8; }
.evo-row:nth-child(5) .tag { color: var(--warm); }

/* ---------- 左右对比 ---------- */
.versus { display: grid; grid-template-columns: 1fr 84px 1fr; align-items: stretch; gap: 0; }

.vs-side {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 34px 34px 36px;
  background: var(--card);
}

.vs-side.past { background: rgba(255, 255, 255, 0.018); }
.vs-side.future {
  border-color: rgba(91, 140, 255, 0.34);
  background: linear-gradient(160deg, rgba(91, 140, 255, 0.12), rgba(138, 123, 255, 0.03));
}

.vs-side .cap {
  font-size: 15px;
  letter-spacing: 0.18em;
  color: var(--ink-3);
  margin-bottom: 14px;
}

.vs-side h3 { font-size: 36px; font-weight: 700; margin-bottom: 22px; }
.vs-side.future h3 { color: #A9C4FF; }

.vs-list { list-style: none; display: flex; flex-direction: column; gap: 14px; }
.vs-list li { font-size: 21px; line-height: 1.55; color: var(--ink-2); display: flex; gap: 12px; }
.vs-list li b { color: var(--ink); font-weight: 600; min-width: 84px; font-size: 19px; }

.vs-mid { display: grid; place-items: center; }
.vs-mid span {
  width: 52px; height: 52px;
  border-radius: 50%;
  display: grid; place-items: center;
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--ink-3);
  font-size: 22px;
}

/* ---------- 流程链 ---------- */
.chain { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.node {
  padding: 13px 20px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.035);
  font-size: 19px;
  line-height: 1.3;
  white-space: nowrap;
}

.node.on {
  border-color: rgba(91, 140, 255, 0.5);
  background: linear-gradient(140deg, rgba(91, 140, 255, 0.22), rgba(91, 140, 255, 0.06));
  color: #CFDDFF;
}

.node.hot {
  border-color: rgba(255, 159, 90, 0.55);
  background: linear-gradient(140deg, rgba(255, 159, 90, 0.2), rgba(255, 159, 90, 0.05));
  color: #FFD3B0;
}

.arrow { color: var(--ink-3); font-size: 17px; }

.legend { display: flex; gap: 30px; align-items: center; font-size: 16px; color: var(--ink-3); padding-left: 152px; margin-bottom: 6px; }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 4px; margin-right: 9px; vertical-align: -1px; }

.flow-row { display: grid; grid-template-columns: 128px 1fr; align-items: center; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line-soft); }
.flow-row:last-of-type { border-bottom: none; }
.flow-row .who { font-size: 21px; font-weight: 600; color: var(--ink); }
.flow-row .who i { display: block; font-style: normal; font-size: 15px; color: var(--ink-3); margin-top: 6px; letter-spacing: .04em; }

/* Agent 循环 */
.loop { display: flex; align-items: center; gap: 12px; flex-wrap: nowrap; }
.loop .node { flex: 1; text-align: center; font-size: 23px; padding: 22px 8px; }
.loop-back {
  margin-top: 16px;
  font-size: 17px;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: 4px;
}
.loop-back::before { content: ""; width: 240px; height: 1px; background: repeating-linear-gradient(90deg, var(--ink-3) 0 6px, transparent 6px 12px); }

/* 大引述块 */
.say-box {
  border-left: 3px solid var(--brand);
  background: linear-gradient(100deg, rgba(91, 140, 255, 0.10), transparent 70%);
  border-radius: 0 14px 14px 0;
  padding: 26px 30px;
  font-size: 29px;
  line-height: 1.6;
  color: #DCE6FF;
  margin: 6px 0 10px;
}

/* ---------- 引用 / Prompt 对比 ---------- */
.prompt-box {
  border-radius: 18px;
  border: 1px solid var(--line);
  padding: 28px 30px;
  background: rgba(255, 255, 255, 0.025);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.prompt-box .cap {
  font-size: 15px;
  letter-spacing: 0.16em;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.prompt-box.bad { border-color: rgba(255, 107, 138, 0.3); }
.prompt-box.bad .cap { color: var(--rose); }
.prompt-box.good { border-color: rgba(63, 217, 164, 0.34); background: linear-gradient(165deg, rgba(63, 217, 164, 0.08), rgba(255, 255, 255, 0.02)); }
.prompt-box.good .cap { color: var(--mint); }

.prompt-text { font-size: 22px; line-height: 1.75; color: var(--ink); }
.prompt-text.small { font-size: 20px; line-height: 1.8; }
.prompt-text u { text-decoration: none; border-bottom: 2px solid rgba(91, 140, 255, 0.5); padding-bottom: 1px; }

.mock {
  margin-top: 20px;
  padding: 18px 20px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.028);
  border: 1px solid var(--line-soft);
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink-3);
}
.mock b { color: var(--ink-2); font-weight: 500; }

.prompt-out { margin-top: auto; padding-top: 20px; border-top: 1px dashed var(--line); font-size: 18px; color: var(--ink-3); line-height: 1.6; }
.prompt-out b { color: var(--ink-2); font-weight: 600; }

.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 18px; }
.tag-pill { font-size: 14px; padding: 5px 12px; border-radius: 8px; background: rgba(91, 140, 255, 0.14); color: #A8C3FF; border: 1px solid rgba(91, 140, 255, 0.22); }

/* ---------- 四级对比（核心页） ---------- */
.levels4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; height: 100%; }

.lvcol {
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 22px 20px 24px;
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.02);
  position: relative;
}

.lvcol:nth-child(1) { background: rgba(255, 255, 255, 0.015); }
.lvcol:nth-child(2) { background: linear-gradient(180deg, rgba(91, 140, 255, 0.06), rgba(255, 255, 255, 0.015)); border-color: rgba(91, 140, 255, 0.2); }
.lvcol:nth-child(3) { background: linear-gradient(180deg, rgba(91, 140, 255, 0.12), rgba(255, 255, 255, 0.015)); border-color: rgba(91, 140, 255, 0.32); }
.lvcol:nth-child(4) { background: linear-gradient(180deg, rgba(255, 159, 90, 0.16), rgba(255, 255, 255, 0.015)); border-color: rgba(255, 159, 90, 0.42); }

.lvcol .head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 16px; }
.lvcol .lv { font-family: var(--mono); font-size: 15px; letter-spacing: 0.12em; color: var(--ink-3); }
.lvcol h4 { font-size: 24px; font-weight: 680; }
.lvcol:nth-child(4) h4 { color: #FFC79A; }

.lvcol .say {
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  padding: 14px 16px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.28);
  border-left: 2px solid rgba(255, 255, 255, 0.18);
  margin-bottom: 16px;
}

.lvcol ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.lvcol li { font-size: 16px; line-height: 1.55; color: var(--ink-2); padding-left: 16px; position: relative; }
.lvcol li::before { content: ""; position: absolute; left: 0; top: 11px; width: 5px; height: 5px; border-radius: 50%; background: var(--ink-3); }

.effort { margin-top: auto; padding-top: 20px; }
.effort .row { display: flex; align-items: center; gap: 9px; margin-top: 9px; }
.effort .cap { font-size: 13px; letter-spacing: .1em; color: var(--ink-3); width: 26px; }
.effort .track { flex: 1; height: 7px; border-radius: 5px; background: rgba(255, 255, 255, 0.07); overflow: hidden; }
.effort .track i { display: block; height: 100%; border-radius: 5px; width: var(--w); }
.effort .you .track i { background: rgba(255, 255, 255, 0.34); }
.effort .ai .track i { background: linear-gradient(90deg, var(--brand), var(--brand-2)); }
.effort .val { font-size: 14px; color: var(--ink-3); width: 74px; text-align: right; }
.lvcol:nth-child(4) .effort .ai .track i { background: linear-gradient(90deg, var(--warm), #FFC15E); }

.lvcol .got {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 16px;
  color: var(--ink-3);
  line-height: 1.55;
}
.lvcol .got b { display: block; color: var(--ink); font-size: 17px; font-weight: 600; margin-bottom: 4px; }
.lvcol:nth-child(4) .got b { color: var(--warm); }

/* ---------- 机会公式 ---------- */
.formula {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 26px 0 30px;
  flex-wrap: wrap;
}

.formula .f {
  font-size: 30px;
  font-weight: 700;
  padding: 14px 26px;
  border-radius: 14px;
  border: 1px solid rgba(91, 140, 255, 0.34);
  background: linear-gradient(150deg, rgba(91, 140, 255, 0.16), rgba(91, 140, 255, 0.03));
  color: #CBDBFF;
}

.formula .x { font-size: 26px; color: var(--ink-3); }

.formula .eq {
  font-size: 30px;
  font-weight: 750;
  padding: 14px 28px;
  border-radius: 14px;
  background: linear-gradient(120deg, var(--warm), #FFC15E);
  color: #21140A;
  margin-left: 8px;
}

.crit { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
.crit .c { border: 1px solid var(--line); border-radius: 16px; padding: 26px 22px 28px; min-height: 236px; display: flex; flex-direction: column; background: rgba(255, 255, 255, 0.025); }
.crit .c h5 { font-size: 22px; font-weight: 650; margin-bottom: 12px; }
.crit .c p { font-size: 17px; line-height: 1.65; color: var(--ink-2); }
.crit .c .no { margin-top: auto; font-size: 15px; color: var(--ink-3); line-height: 1.6; padding-top: 16px; border-top: 1px dashed var(--line); }
.crit .c .no b { color: var(--rose); font-weight: 500; }

/* ---------- 场景网格 ---------- */
.scenes { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.scene {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px 24px 30px;
  min-height: 150px;
  background: rgba(255, 255, 255, 0.028);
}
.scene h5 { font-size: 23px; font-weight: 620; margin-bottom: 12px; }
.scene p { font-size: 17px; line-height: 1.65; color: var(--ink-3); }

/* ---------- 步骤诊断 ---------- */
.steps-q { display: flex; flex-direction: column; gap: 9px; }
.q-row {
  display: grid;
  grid-template-columns: 54px 400px 1fr;
  align-items: center;
  gap: 26px;
  padding: 13px 24px;
  border-radius: 12px;
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.02);
}
.q-row .num { font-family: var(--mono); font-size: 15px; color: var(--brand); letter-spacing: .08em; }
.q-row .q { font-size: 23px; font-weight: 600; }
.q-row .hint { font-size: 17px; color: var(--ink-3); line-height: 1.5; }
.q-row:last-child { border-color: rgba(255, 159, 90, 0.4); background: rgba(255, 159, 90, 0.08); }
.q-row:last-child .q { color: #FFC79A; }
.q-row:last-child .num { color: var(--warm); }

/* ---------- 结论清单 ---------- */
.takeaways { display: flex; flex-direction: column; gap: 16px; }
.ta {
  display: grid;
  grid-template-columns: 60px 1fr;
  align-items: center;
  gap: 24px;
  padding: 20px 26px;
  border-radius: 14px;
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.022);
}
.ta .num {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--ink-3);
}
.ta p { font-size: 27px; line-height: 1.45; font-weight: 550; }
.ta.key {
  border-color: rgba(255, 159, 90, 0.45);
  background: linear-gradient(100deg, rgba(255, 159, 90, 0.14), rgba(255, 159, 90, 0.02));
}
.ta.key .num { color: var(--warm); }
.ta.key p { color: #FFD8B8; font-weight: 650; }

/* ---------- Before / After 三组 ---------- */
.ba { display: flex; flex-direction: column; gap: 18px; }
.ba-row {
  display: grid;
  grid-template-columns: 1fr 60px 1fr;
  align-items: center;
  gap: 18px;
  padding: 22px 26px;
  border-radius: 16px;
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.02);
}
.ba-row .b { font-size: 21px; color: var(--ink-3); line-height: 1.55; }
.ba-row .a { font-size: 22px; color: var(--ink); line-height: 1.55; }
.ba-row .a b { color: var(--mint); font-weight: 620; }
.ba-row .mid { text-align: center; color: var(--ink-3); font-size: 20px; }

/* ---------- 小标注 ---------- */
.note-inline {
  margin-top: 20px;
  font-size: 18px;
  color: var(--ink-3);
  display: flex;
  align-items: center;
  gap: 10px;
}
.note-inline::before { content: ""; width: 3px; height: 16px; background: var(--brand); border-radius: 2px; }

/* ---------- 分步动画 ---------- */
.frag { opacity: 0; transform: translateY(10px); transition: opacity .38s ease, transform .38s cubic-bezier(.2,.7,.25,1); }
.frag.on { opacity: 1; transform: none; }
body.no-anim .frag { opacity: 1 !important; transform: none !important; }

/* ---------- 界面外框 ---------- */
#chrome { position: fixed; inset: 0; pointer-events: none; z-index: 40; }

#progress {
  position: absolute;
  left: 0; top: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2), var(--warm));
  transition: width .35s ease;
}

#pager {
  position: absolute;
  right: 26px; bottom: 20px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.1em;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

#pager .cur { color: var(--ink-2); }
#pager button {
  pointer-events: auto;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
  color: var(--ink-3);
  border-radius: 7px;
  width: 26px; height: 24px;
  cursor: pointer;
  font-size: 12px;
  transition: .18s;
}
#pager button:hover { color: var(--ink); background: rgba(255, 255, 255, 0.12); }

#timer {
  position: absolute;
  left: 26px; bottom: 20px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--ink-3);
  pointer-events: auto;
  cursor: pointer;
  padding: 4px 10px;
  border-radius: 7px;
  border: 1px solid transparent;
}
#timer.run { color: var(--mint); border-color: rgba(63, 217, 164, 0.25); background: rgba(63, 217, 164, .06); }

#hint {
  position: absolute;
  left: 50%; bottom: 18px;
  transform: translateX(-50%);
  font-size: 12px;
  letter-spacing: .12em;
  color: rgba(255, 255, 255, 0.16);
  transition: opacity .6s ease;
}
#hint.hide { opacity: 0; }

/* 演讲者备注 */
#notes {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  max-height: 42vh;
  overflow: auto;
  background: rgba(6, 9, 16, 0.97);
  border-top: 1px solid var(--line);
  padding: 24px 34px 28px;
  z-index: 60;
  transform: translateY(101%);
  transition: transform .3s cubic-bezier(.2,.7,.25,1);
  backdrop-filter: blur(14px);
}
#notes.open { transform: none; }
#notes h6 { font-size: 12px; letter-spacing: .2em; color: var(--ink-3); margin-bottom: 14px; }
#notes .nt { font-size: 16px; line-height: 1.8; color: var(--ink-2); max-width: 1250px; }
#notes .nt b { color: var(--ink); font-weight: 600; }
#notes .nt em { font-style: normal; color: var(--warm); }
#notes .nt ul { margin: 8px 0 8px 20px; }
#notes .nt li { margin: 4px 0; }

/* 目录 */
#toc {
  position: fixed;
  inset: 0;
  background: rgba(5, 7, 14, 0.96);
  backdrop-filter: blur(18px);
  z-index: 70;
  display: none;
  padding: 54px 64px;
  overflow: auto;
}
#toc.open { display: block; }
#toc h3 { font-size: 15px; letter-spacing: .22em; color: var(--ink-3); margin-bottom: 26px; }
#toc .cols { columns: 3; column-gap: 46px; }
#toc a {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 14px;
  padding: 9px 12px;
  border-radius: 9px;
  color: var(--ink-2);
  text-decoration: none;
  font-size: 16px;
  break-inside: avoid;
  border: 1px solid transparent;
  align-items: baseline;
}
#toc a:hover { background: rgba(255, 255, 255, 0.06); color: var(--ink); }
#toc a.now { border-color: rgba(91, 140, 255, .4); background: rgba(91, 140, 255, .1); color: #BFD2FF; }
#toc a .i { font-family: var(--mono); font-size: 12px; color: var(--ink-3); }
#toc a .s { font-size: 12px; color: var(--ink-3); display: block; margin-top: 3px; letter-spacing: .06em; }

/* ---------- 打印 / 导出 PDF ---------- */
@media print {
  @page { size: 1600px 900px; margin: 0; }
  * { -webkit-print-color-adjust: exact !important; print-color-adjust: exact !important; }
  html, body { overflow: visible; height: auto; background: #05070E; }
  #chrome, #notes, #toc, #hint { display: none !important; }
  #viewport { position: static; display: block; }
  #stage { position: static; transform: none !important; width: 1600px; height: auto; }
  .slide {
    position: relative;
    display: flex !important;
    opacity: 1 !important;
    animation: none !important;
    width: 1600px;
    height: 900px;
    page-break-after: always;
    break-after: page;
    background: linear-gradient(160deg, #05070E 0%, #080D1B 45%, #05070E 100%);
  }
  .frag { opacity: 1 !important; transform: none !important; }
  .notes { display: none !important; }
}